Clinch, with "up" (3)
I believe the answer is:
sew
'clinch with up' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sew that I've seen before include "Stitch with needle and thread" , "Tack" , "Fasten with stitches" , "Work with needle and thread" , "Do some needlework" .)